Angled structural member with recessed thin wall for drilling or knock-out

Abstract

An improvement on an angled structural member comprises an elongated member with an "L-shape" cross section. The said member has a smooth face in the outer surface on one hand, and a plurality of recesses in the inner face on the other hand. Each of the recesses further includes a circular cavity which remains an integrated thin wall at one end of the cavity.

I claim: 
     
       1. A structural member extending in a longitudinal direction having a substantially L-shaped cross-sectional contour forming a pair of substantially orthogonally directed leg members, each of said leg members having opposing sides forming an inner surface and an outer surface defining a thickness dimension of said leg members, each of said leg outer surfaces forming a planar contour and each of said inner surfaces having formed therethrough a plurality of blind openings defined by a plurality of first recesses having a first opening recess dimension and a plurality of second recesses aligned with respective ones of said first recesses and having a second opening recess dimension less than said first opening recess dimension, each of said first and second recesses in combination having a thickness dimension less than said thickness dimension of said leg members. 
     
     
       2. The structural member as recited in claim 1 where each of said first recess opening dimensions define a predetermined polygonal contour for mating insert therein of a fastening nut substantially having said predetermined polygonal contour for mounting said fastening nut within said first recess and preventing rotation of said fastening nut therein. 
     
     
       3. The structural member as recited in claim 2 where said predetermined polygonal contour is a hexagonal contour. 
     
     
       4. The structural member as recited in claim 1 where each of said second recesses define a base section adapted to be removed by impact thereon of an impact member. 
     
     
       5. The structural member as recited in claim 1 including indicia formed on said leg inner surface forming a plurality of spaced apart marking line indicia for (1) aligning one of said structural members to another of said structural member, and, (2) providing a longitudinal measure of said structural member. 
     
     
       6. The structural member as recited in claim 5 where said plurality of spaced apart marking line indicia form a plurality of mutually orthogonal and intersecting marking lines inscribed within a respective leg inner surface. 
     
     
       7. The structural member as recited in claim 5 where said plurality of said spaced apart marking line indicia includes a plurality of numerical scale indicia for labeling said spaced apart marking line indicia.